On endomorphism semigroups of a fuzzily structured set. - Veniamin Shteinbuk; Alexander P. Sostak (Kybernetika, 1992)

Extremal problems of approximation theory in fuzzy context. - Svetlana V. Asmuss; Alexander P. Sostak (Fuzzy Sets Syst., 1999)

Fuzzy analysis and related topics. - Martin Kalina; Alexander P. Sostak (Fuzzy Sets Syst., 1999)

On central algorithms of approximation under fuzzy information. - Svetlana V. Asmuss; Alexander P. Sostak (Fuzzy Sets Syst., 2005)

On L-valued Equalites on the L-powersets of Many-valued Sets. - Ingrida Uljane; Alexander P. Sostak (EUSFLAT Conf. (2), 2007)

On M-Approximative Operators and M-Approximative Systems. - Alexander P. Sostak (IFSA/EUSFLAT Conf., 2009)

Ideal-valued topological structures. - Javier Gutiérrez García; Tomasz Kubiak; Alexander P. Sostak (Fuzzy Sets Syst., 2010)

Towards the theory of M-approcimate systems: Fundamentals and examples. - Alexander P. Sostak (Fuzzy Sets Syst., 2010)

Preface of the guest editors. - Ferdinand Chovanec; Olga Nánásiová; Alexander P. Sostak (Soft Comput., 2010)

Categories Related to Topology Viewed as Soft Sets. - Banu Pazar Varol; Alexander Shostak; Halis Aygün (EUSFLAT Conf., 2011)

On spline methods of approximation under L-fuzzy information. - Svetlana V. Asmuss; Alexander P. Sostak (FUZZ-IEEE, 2011)

Bornological structures in the context of L-fuzzy sets. - Alexander P. Sostak; Ingrida Uljane (EUSFLAT Conf., 2013)

L-fuzzy syntopogenous structures, Part I: Fundamentals and application to L-fuzzy topologies, L-fuzzy proximities and L-fuzzy uniformities. - Dace Cimoka; Alexander P. Sostak (Fuzzy Sets Syst., 2013)

Fuzzy sets: Theory and applications (FSTA 2012). - Radko Mesiar; Martin Stepnicka; Alexander P. Sostak (Fuzzy Sets Syst., 2013)

M-valued Measure of Roughness for Approximation of L-fuzzy Sets and Its Topological Interpretation. - Sang-Eon Han; Alexander P. Sostak (IJCCI (Selected Papers), 2014)

Fuzzy Function and the Generalized Extension Principle. - Irina Perfilieva; Alexandr Sostak (IJCCI (FCTA), 2014)

Measure of Roughness for Rough Approximation of Fuzzy Sets and Its Topological Interpretation. - Alexander P. Sostak (IJCCI (FCTA), 2014)

Variable-Range Approximate Systems Induced by Many-Valued L-Relations. - Aleksandrs Elkins; Sang-Eon Han; Alexander P. Sostak (IPMU (3), 2014)

On approximate-type systems generated by L-relations. - Sang-Eon Han; In-Soo Kim; Alexander P. Sostak (Inf. Sci., 2014)

On two categories of many valued relations. - Dikran Dikranjan; Alexander P. Sostak (IFSA-EUSFLAT, 2015)

From Lattice Valued Theories to Lattice Valued Analysis. - Irina Perfilieva; Alexandr Sostak (Towards the Future of Fuzzy Logic, 2015)

On a Category of Extensional Fuzzy Rough Approximation L-valued Spaces. - Aleksandrs Elkins; Alexander P. Sostak; Ingrida Uljane (IPMU (2), 2016)

Fragmentary Fuzzy Pseudometrics: Basics of the Theory and Applications in Combinatorics on Words. - Raivis Bets; Alexander P. Sostak (Balt. J. Mod. Comput., 2016)

Fuzzifying topology induced by a strong fuzzy metric. - Juan-José Miñana; Alexandr Sostak (Fuzzy Sets Syst., 2016)

L-valued bornologies on powersets. - Alexander P. Sostak; Ingrida Uljane (Fuzzy Sets Syst., 2016)

Fuzzy φ-pseudometrics and Fuzzy φ-pseudometric Spaces. - Alexander P. Sostak; Raivis Bets (EUSFLAT/IWIFSGN (3), 2017)

M-bornologies on L-valued Sets. - Ingrida Uljane; Alexander P. Sostak (EUSFLAT/IWIFSGN (3), 2017)

George-Veeramani Fuzzy Metrics Revised. - Alexander P. Sostak (Axioms, 2018)

On the measure of M-rough approximation of L-fuzzy sets. - Sang-Eon Han; Alexander P. Sostak (Soft Comput., 2018)

Some remarks on topological structures in the context of fuzzy relational mathematical morphology. - Alexander P. Sostak; Ingrida Uljane (EUSFLAT Conf., 2019)

Many-level fuzzy rough approximation spaces induced by many-level fuzzy preorders and the related ditopological structures. - Alexander P. Sostak; Ingrida Uljane; Aleksandrs Elkins (EUSFLAT Conf., 2019)

Fuzzy Relational Mathematical Morphology: Erosion and Dilation. - Alexander P. Sostak; Ingrida Uljane; Patrik Eklund (IPMU (3), 2020)

On t-Conorm Based Fuzzy (Pseudo)metrics. - Olga Grigorenko; Juan-José Miñana; Alexandr Sostak; Óscar Valero (Axioms, 2020)

Categories of quantale-valued fuzzy automata: determinization and minimization. - M. K. Dubey; S. P. Tiwari; Alexander P. Sostak (J. Appl. Math. Comput., 2020)

Aggregation of Operators of Fuzzy Relational Mathematical Morphology: Erosion and Dilation. - Alexander P. Sostak; Ingrida Uljane (IFSA/EUSFLAT/AGOP, 2021)

Graded Fuzzy Preconcept Lattices: Theoretical Basis. - Alexander P. Sostak; Ingrida Uljane; Maris Krastins (IFSA/EUSFLAT/AGOP, 2021)

Application of Graded Fuzzy Preconcept Lattices in Risk Analysis. - Maris Krastins; Ingrida Uljane; Alexander Shostak (IJCCI, 2021)

Gradation of Fuzzy Preconcept Lattices. - Alexander P. Sostak; Ingrida Uljane; Maris Krastins (Axioms, 2021)

Graded concept lattices in fuzzy rough set theory. - Alexander P. Sostak; Maris Krastins; Ingrida Uljane (CLA, 2022)

Parameterized Metrics and Their Applications in Word Combinatorics. - Raivis Bets; Alexander P. Sostak; Emils Mikelis Mikelsons (IPMU (1), 2022)

Conceptuality Degree of Oriented Crisply Generated Fuzzy Preconcepts. - Alexander P. Sostak; Maris Krastins; Ingrida Uljane (EUSFLAT/AGOP, 2023)

Powerset operators induced by fuzzy relations as a basis for fuzzification of various mathematical structures. - Alexander P. Sostak; Ingrida Uljane (Int. J. Approx. Reason., 2023)

On metrization of fuzzy metrics and application to fixed point theory. - Juan-José Miñana; Alexander P. Sostak; Óscar Valero (Fuzzy Sets Syst., 2023)

Extending L-Topologies to Bipolar L-Fuzzy Topologies. - Alexandr Sostak; Ingrida Uljane (Axioms, 2024)